Figure 1.
Drawing of a sporangiophore and sporangia of Pseudoperonospora cubensis isolated from Cucumis sativus.
Measurements were taken for the length of the sporangiophore (a), height of the first ramification (b), width of the trunk (c), length of the longer (d) and shorter (e) ultimate branchlets, as well as the length (f) and the width (g) of sporangia.
Table 1.
Morphological characteristics of Pseudoperonospora cubensis on various Cucurbitaceae.
Table 2.
Plasticity values of Pseudoperonospora cubensis on various Cucurbitaceae.
Figure 2.
Number of statistically significant differences in morphological characteristics of Pseudoperonospora cubensis on a set of twelve cucurbitaceous hosts for all 66 possible host-host comparisons (A) and without the respectively two most deviating hosts, resulting in 45 possible host-host comparisons (B).
Excluded in B were the hosts as follows for the characteristics from left to right: 1. Cucumis melo, Luffa cylindrica; 2. C. melo, Cucurbita moschata; 3. and 4. Thladiantha dubia, Cucumis anguria; 5. C. anguria, Lu. cylindrica; 6. and 7. T. dubia, Cyclanthera pedata; 8. T. dubia, C. anguria; 9. Lagenaria siceraria, Cu. moschata; 10. Cy. pedata, Sicyos angulatus; 11. La. siceraria, Cy. pedata; 12. Lu. cylindrica, La. siceraria.
Figure 3.
Estimation of the total amount of infective units of Pseudoperonospora cubensis per leaf area of the respective cucurbitaceous hosts.
Table 3.
Sporulation density and potential numbers of sporangia and zoospores.